GGG should skip Super Middleweight and go straight to LHW after his next fight because MW is full of bums except Peter Quillin who would be a good fight for GGG. Super Middleweight isn't even a real division like all those other Supers and Lights
GGG needs to clear up the middleweight division first. Be patient. Otherwise the critics will say "he coulda fought X, but he bottled it and jumped up a division." Let him rule a division first before you put him beside the ATG's. If he smashes David, then Cotto/Canelo, then maybe Quillin/Jacobs just to prove a point. Then move up. He's clearly proven king of his division so then we go to the next level.
He turned pro later in life. They turned pro early in life. When he was the age they turned pro he was fighting at welterweight. Pacquiao and Mayweather didn't even do a spectacular amount of weight climbing for their frames. Mayweather is a natural welter and Pac is a natural lightweight the same as Golovkin is a natural middle. So basically, Pac moved up two weight classes, May moved up one for two fights, and Golovkin is right where he's supposed to be.
TUE and Pac just got fat; you could say they are a (any number) division champ if they can make the first division they started at, otherwise it don't mean $hit.